1、 WORLDWIDE ENGINEERING STANDARDS Material Specification GMW3083 Engine Oil Pan and Transmission Bottom Pan Gaskets Copyright 2012 General Motors Company All Rights Reserved November 2012 Originating Department: North American Engineering Standards Page 1 of 19 1 Scope Note: This commodity standard d
2、escribes the requirements for engine oil pan and transmission bottom pan gaskets. The constructional and component features covered by this standard are described below. Do not use this document for applications outside the scope and 1.3 descriptions of this standard. 1.1 Material Description. Table
3、 1 describes the Class (A, B, F, or S) for engine (E) and/or transmission (T) elastomers meeting the designated temperature range and application. If no small capital letter is beside a Class, it applies to both engine and transmission. A hardness range for compounds is assigned by type using a nume
4、ric or alpha-numeric designation (see Table 3). Part Performance Requirements are in 3.19 and Table 6. Table 1: Material and Application Criteria Designation Class Temperature Range C Note 1 Application Elastomer Note 2 AE -40 to 165 Low volatile (oxygen sensor safe), non-post cured Low Temperature.
5、 See Appendix A, Legacy and Service use only tables. VMQ AT -25/-20 to 150 Transmission Standard Use. See Table 5 Transmission Requirements. AEM/ACM B -20 to 165 Oil resistant Standard use Note 3. See Table 3A Engine Class Requirements and Table 4A Engine Requirements. ACM B -25 to165 AEM C -15 to 1
6、75 High temperature and oil resistance Standard use polymer. FKM/FPM DE -29 to 165 Flex fuel and oil resistance Improved low temperature, fuel dilution 5% to 10% by volume with constant immersion or high exposure. FKM/FPM FE -20 to 165 Fuel/oil dilution resistant Fuel dilution 5% to 10% by volume. U
7、nder constant immersion or high exposure. ACM SE -40 to 150 Formed-in-place or cured-in-place, low odor, low volatile Note 4 Standard use in joints with fastening and design features intended for this product. Fuel dilution 5% or less. VMQ Note 1: As defined by ASTM D1329 Low Temperature Retraction
8、(TR10) and SAE J2236 respectively. Note 2: Nomenclature symbol as defined by ASTM D1418 or ISO 1629. Others will be added as needed. Note 3: Ethylene acrylic rubber (AEM) is not on GM Bill of Material for engines. Note 4: See Table 2 on Sealants. Copyright General Motors Company Provided by IHS unde
9、r license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW3083 Copyright 2012 General Motors Company All Rights Reserved November 2012 Page 2 of 19 1.1.1 Part Constructions. Construction usage code le
10、tters that apply to this standard are in Table 2. Table 2: Construction Usage Code Letters Construction Feature Code Letters Note 1 Elastomer with Carrier. Plastic carriers are designated with a lower case letter “p” after this letter. Cp Elastomer with Carrier. Metal carriers use a lower case “m” a
11、fter this letter. Cm Elastomer Only. Press-in-place designs for a machined or as cast groove. E Sealants. Formed-in-place, cured-in-place or molded dispensed compounds, e.g., Room Temperature Vulcanized (RTV) sealants are specified by 998 bulk part number for General Motors North America (GMNA) prin
12、ts. Print notes shall reference the appropriate functional performance elements (8.1.5) of this standard if sealants are the chosen compounds. S Note 1: Code letters designate specific tests that apply only to that construction and/or material for detail drawing specifications. See Section 8 for pro
13、per use protocol. 1.2 Symbols. 1.2.1 Plastic and rubber parts shall be marked with a symbol to designate the type of material from which the part was fabricated for the purpose of collection and handling of parts for recycling. 1.2.2 Elastomer Marking Symbol. Mark rubber parts weighing more than 200
14、 g per ISO 1629. Marking size and location per SAE J2332. For Example: Polyacrylate ACMPA-GF30. 1.3 Typical Applications. Gaskets or seals for lower engine (below engine block) and transmission bottom pan joints. O-rings and rubber coated metal gaskets for these applications are covered in other req
15、uirements. 1.4 Remarks. 1.4.1 Approved compounds properties for each type of elastomer are listed in Tables 3A, Table 4A, Table 5, and Table 6. Table values by type are a compilation of data from multiple approved compounds. GM Powertrain GM Engine only; ethylene acrylic rubber (AEM) is not permitte
16、d as part of the Assembly Fastening and Sealing Bill of Material (BOM). Properties from molded parts are found in Tables 3A_1, 3_B1, and 3_C1. 1.4.2 Silicone elastomer gasket compounds approved to this standard are safe for use near oxygen sensors (comply with GM9009P limit) and do not contribute to
17、 oil foaming (complies with 3.19.1.7). Parts made from silicone rubber approved to this standard are not post cured. Design is a critical factor for successful sealing when selecting silicone compounds. If properly protected and compressed, silicone is a satisfactory performer. See Appendix A. 1.4.3
18、 Satisfactory GMW3155 test results are compound and design dependent. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW3083 Copyright 2012
19、 General Motors Company All Rights Reserved November 2012 Page 3 of 19 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. AIAG D-22 ASTM D1505 ISO 37 ISO 11469 ASTM D297 ASTM D2240 ISO 48 ISO 13226 ASTM D395 ASTM D3
20、182 ISO 815 ISO/IEC 17025 ASTM D412 ASTM D3418 ISO 1101 ISO/TS 16949 ASTM D471 ASTM D3677 ISO 1629 SAE J300 ASTM D624 ASTM D4485 ISO 1817 SAE J1351 ASTM D892 ASTM E1131 ISO 4650 SAE J2236 ASTM D1329 ASTM SF 105 ISO 7111 SAE J2332 ASTM D1415 IEEE/ASTM SI 10 ISO 7619-1 SAE J2643 ASTM D1418 ISO 34-1 IS
21、O 11357 SAE 5W30 2.2 GM Standards/Specifications. 9982257 GME L0004 GMW3116 GMW16137 9986153 GMN3922 GMW3155 GMW16177 GM7400M GMW3059 GMW14872 GMW16678 GM9009P GMW3083 GMW15827 2.3 Additional References. Automotive Industry Action Group (AIAG) D-22, Best Practice Unified Procedure for Approval of Ru
22、bber and Plastic Formulation Ingredient Changes, 26200 Lahser Road, Suite 200, Southfield, MI 48033-7100. Rubber Manufacturers Association (RMA) Handbook for Molded, Extruded Lathe Cut, and Cellular Products (Published by The Rubber Manufacturers Association, Inc., 1400 K Street, NW #900, Washington
23、, DC 20005). Test Matrix available from GM Powertrain Materials Engine Engineering. Refer GMW3083. TMC003 Material Safety Data Sheet guidance documents (available at ). 3 Requirements 3.1 Test Preparation and Evaluation. 3.1.1 Resources. 3.1.1.1 Calibration. The test facilities equipment shall be in
24、 good working order and shall have a valid calibration label. 3.2 Elastomer Test Specimens Preparation. Specimens used to develop all table properties are die-cut specimens from ASTM D3182 sheet stock molded to the same conditions as for actual products, with post cure if applicable. Precondition sl
25、abs at 50% Relative Humidity (RH) and 23 C for at least 16 h before testing. As an option, specimens from non-post cure compounds may be used from production molds. Report the cure time and temperature conditions for all molded specimens. 3.2.1 Elastomer Test Specimens Parts. Specimens can be die-cu
26、t from production molds to a coupon size. When preparing tensile test specimens from finished parts, in some cases not all dimensions of the (ISO 37 type 4) dumbbell can be obtained as specified, e.g., the width of the ends. These test specimens can still be used, if the narrow portion has the corre
27、ct specified values and a widening of the ends of the dumbbell exists. The test specimen should have the following properties: The ends of the dumbbell where it is clamped should be at least twice the width of the narrow portion of the dumbbell. This increase in width should be symmetrical about the
28、 narrow portion of the test specimen. The length of the tab ends must be sufficient to insure secure clamping. Note: Length is based on clamp type. 3.2.2 Metal and plastic specimens are prepared to the appropriate GMW standard referenced in this document or production drawing. If no GM standard is a
29、vailable, use the appropriate industry standard referenced in this document or appropriate detail drawing. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEE
30、RING STANDARDS GMW3083 Copyright 2012 General Motors Company All Rights Reserved November 2012 Page 4 of 19 3.3 Test Units. Report data in the appropriate International System of Units (SI) using IEEE/ASTM SI 10. 3.4 Test Conditions. If not otherwise stated, mechanical properties in delivery state a
31、nd after heat or fluid immersion are to be tested at +23 C and with the same test methods. Unless otherwise specified, conduct testing at 50% relative humidity (RH) and 23 C. If temperature and humidity are known not to significantly affect test results, use a relative humidity range of 30% to 55% a
32、nd temperature range of 20 C to 32 C. All test conditions must be within 2 h 2 C and 5% RH of the specified numbers unless otherwise indicated. 3.5 Elastomer Compound Table Data. Each approved elastomer compound shall meet its table, and section item requirements. Individual compound property tests
33、represent characteristics that are significant to the intended usage (see Table 1) per agreement between the compound supplier and GM engineering personnel. Type data can represent the collective property profile of more than one compound (e.g., Type 6 in all Tables 3A through 5). Therefore, it may
34、be inappropriate to use this data for quality control of a single compound. 3.5.1 Global or Cross Regional Compounds. Compound formulations produced in more than one (1) mix facility but sharing a common compound identification shall be subject to review. The level of testing and approval may be by
35、polymer source and/or mix site depending on the variation permitted in ingredient selection and process conditions. Approvers are responsible for tracking production compound history and managing local variation as part of the formal approval process. 3.5.1.1 Contingency. As part of the approval pro
36、cess, each compound supplier shall have a designated alternative mix operation. Compound from that location(s) shall be evaluated to 3.6 Table Data Requirements tentative approval conditions. 3.6 Table Data Requirements. Approved elastomer compound specification values (with noted exceptions) are st
37、atistically based on a six sigma limit spread in (normal distribution) data from minimum of six (6) production lots (five (5) data points/lot). Tentative approval signified by the letter “T” will be given based on data from one production and three lab lots. Tier one sources will be responsible for
38、continuing to submit data until the total number of samples is met for full qualifications as stated in the first line of this paragraph. Appropriate industry statistical standards, methods or practices should be used when generating data. 3.7 Test Frequency. Chemical requirements of 3.14.4, long te
39、rm aging tests (1008 h or more) in Tables 3, 4, 5 and part performance requirements in Table 6 (except part micro-hardness and adhesion), shall be performed once for initial approval. Unless otherwise specified in the test procedure, all once for initial approval tests and compression set tests shal
40、l be run on three (3) specimens from one (1) production batch with each meeting the requirements. The noted exceptions, part micro-hardness and adhesion (carrier gaskets) shall be run on five (5) random samples at two (2) widely diverging points on the part from each of three (3) production lots. Re
41、port all individual values. The remaining tests in Tables 3A through 5 shall be performed on a minimum of six (6) batches described in 3.6 Table Data Requirements. Upon completion of the data requirements for table development, the approved compound source is only required to satisfy ISO/TS 16949 re
42、quirements (Production Part Approval Process, Appendix D) and their internal test frequency. For statistical reporting of data, use the GMW3083 test matrix available from General Motors Powertrain Group (GMPTG) Materials Engineering. 3.8 Number of Test Specimens. New elastomer approvals shall be bas
43、ed on the median of five (5) specimens per test unless otherwise specified. Tests designated as once for initial approval (not for further statistical analysis) shall be run on a minimum of three (3) specimens, with each specimen meeting the stated requirements. Report all individual values. 3.9 Pla
44、stic Constructions (Cp). Part properties have to be defined on part drawing. References to plastic material should contain the appropriate GMW or regional standards for the approved materials. Approved material sources are found in MATSPC. For regional North America applications, use GM7400M to spec
45、ify part properties. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW3083 Copyright 2012 General Motors Company All Rights Reserved Novem
46、ber 2012 Page 5 of 19 3.10 Regrind. Regrind is defined in GMW3116. A production part molder/supplier must identify for development and production test parts the intended level and to test to that maximum level. It is the responsibility of the molder-fabricator and material source to establish what l
47、evel can be used, number of reuses, blend ratios, etc., and provide data that the values stated on the detail drawing can be met (at that regrind level). Only dedicated, reprocessed approved material can be used with virgin stock. Reprocessed feed streams must be separated by percent base polymer (e
48、.g., percent fluorine in fluorocarbon rubber, cure system, and color if integral and used only in like compounds. Parts must be tested for specification limits and validated at the maximum production intent regrind level. A 10% maximum plastic regrind is recommended. Prints without a regrind referen
49、ce or GM7400M code are to use 100% virgin material. 3.11 Safety. This standard may involve hazardous materials, operations, and equipment. This standard does not address all of the safety concerns associated with its use. It is the responsibility of the user of this standard to consult and establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. 3.12 Doc
